﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Security;

namespace dbPoll_Application.Models
{
    public enum ForgotPasswordStatus
    {
        ForgotPasswordGetSecurityQuestion = 0,
        ForgotPasswordRespondToSecurityQuestion = 1,
        ForgotPasswordUnknownSecurityAnswer = 2,
        ForgotUsernameAndPassword = 3
    }

    #region Models

    public class ChangePasswordModel
    {
        [Required(ErrorMessage = "The old password field is required")]
        [DataType(DataType.Password)]
        public string OldPassword { get; set; }

        [Required(ErrorMessage = "The new password field is required")]
        [ValidatePasswordLength(ErrorMessage = "The new password field must be at least 7 characters in length")]
        [DataType(DataType.Password)]
        public string NewPassword { get; set; }

        [Required(ErrorMessage = "The confirm password field is required")]
        [DataType(DataType.Password)]
        public string ConfirmPassword { get; set; }
    }



    public class LogOnModel
    {
        [Required(ErrorMessage = "The username field is required")]
        public string UserName { get; set; }

        [Required(ErrorMessage = "The password field is required")]
        [DataType(DataType.Password)]
        public string Password { get; set; }

        public bool RememberMe { get; set; }

        [ReadOnly(true)]
        public string Url { get; set; }

        public string ReturnUrl { get; set; }
    }

    public class GenericEmailModel
    {
        public string Heading { get; set; }

        public string Content { get; set; }

        public string Username { get; set; }

        public string Password { get; set; }
    }

    public class ForgotPasswordModel
    {
        public ForgotPasswordStatus Status { get; set; }

        public string Username { get; set; }

        public string SecurityQuestion { get; set; }

        public string SecurityAnswer { get; set; }

        public string Email { get; set; }

        [ReadOnly(true)]
        public string Url { get; set; }
    }

    public class FirstLogOnModel
    {
        [Required]
        public string UserName { get; set; }

        [Required]
        [DataType(DataType.Password)]
        public string OldPassword { get; set; }

        [Required(ErrorMessage = "The new password field is required")]
        [ValidatePasswordLength(ErrorMessage = "The new password field must be at least 7 characters in length")]
        [DataType(DataType.Password)]
        public string NewPassword { get; set; }

        [Required(ErrorMessage = "The new password field is required")]
        [DataType(DataType.Password)]
        public string ConfirmPassword { get; set; }

        [Required(ErrorMessage = "The security question field is required")]
        public string SecurityQuestion { get; set; }

        [Required(ErrorMessage = "The security answer field is required")]
        public string SecurityAnswer { get; set; }

        public bool RememberMe { get; set; }

        [ReadOnly(true)]
        public string Url { get; set; }
    }

    public class ResetPasswordModel
    {
        [Required(ErrorMessage = "The username field is required")]
        public string UserName { get; set; }

        [DataType(DataType.Password)]
        public string OldPassword { get; set; }

        [Required(ErrorMessage = "The new password field is required")]
        [ValidatePasswordLength(ErrorMessage = "The new password field must be at least 7 characters in length")]
        [DataType(DataType.Password)]
        public string NewPassword { get; set; }

        [Required(ErrorMessage = "The confirm password field is required")]
        [DataType(DataType.Password)]
        public string ConfirmPassword { get; set; }

        [ReadOnly(true)]
        public string Url { get; set; }
    }

    public class ManageAccountsModel
    {
        public ICollection<User> Users { get; set; }

        public ICollection<Role> Roles { get; set; }

        public ICollection<SelectListItem> SortFilters { get; set; }

        public string SelectedOrderByFilter { get; set; }

        public string SelectedRoleName { get; set; }

        public string SelectedDemographic { get; set; }

        public string SelectedOrganisation { get; set; }

        public string SelectedLocation { get; set; }
    }

    public class AccountManagerModel
    {
        [Required]
        public string UserName { get; set; }

        [Email(ErrorMessage = "The Email format is invalid.")]
        public string Email { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public Gender Gender { get; set; }

        public String Organisation { get; set; }

        public string Position { get; set; }

        public string City { get; set; }

        public string Country { get; set; }

        [Required]
        public string SelectedRole { get; set; }

        public bool IsGeneric { get; set; }

        public List<GenericEmail> GenericEmails { get; set; }

        public bool IsEditable { get; set; }

        public bool IsNew { get; set; }

        public List<User> InUsersGroup { get; set; }

        public List<User> NotInUsersGroup { get; set; }

        public List<String> InUsersGroupSelected { get; set; }

        public List<String> NotInUsersGroupSelected { get; set; }

        public DateTime AccountExpiryDate { get; set; }
    }

    public class ChangeSecurityQuestionAndAnswerModel
    {
        [Required]
        [DataType(DataType.Password)]
        public string Password { get; set; }

        [Required]
        public string SecurityQuestion { get; set; }

        [Required]
        [DataType(DataType.Password)]
        public string SecurityAnswer { get; set; }
    }

    public class ChangePersonalDetailsModel
    {
        public string FirstName { get; set; }

        public string LastName { get; set; }

        [Required]
        public string Email { get; set; }

        public Gender Gender { get; set; }

        public string Position { get; set; }

        public string City { get; set; }

        public string Country { get; set; }
    }

    #endregion

    #region Services
    // The FormsAuthentication type is sealed and contains static members, so it is difficult to
    // unit test code that calls its members. The interface and helper class below demonstrate
    // how to create an abstract wrapper around such a type in order to make the AccountController
    // code unit testable.

    public interface IMembershipService
    {
        int MinPasswordLength { get; }

        bool ValidateUser(string userName, string password);
        MembershipCreateStatus CreateUser(string userName, string password, string email, bool isGeneric);
        bool ChangePassword(string userName, string oldPassword, string newPassword);
    }

    public class AccountMembershipService : IMembershipService
    {
        private readonly MembershipProvider _provider;

        public AccountMembershipService()
            : this(null)
        {
        }

        public AccountMembershipService(MembershipProvider provider)
        {
            _provider = provider ?? Membership.Provider;
        }

        public int MinPasswordLength
        {
            get
            {
                return _provider.MinRequiredPasswordLength;
            }
        }

        public bool ValidateUser(string userName, string password)
        {
            if (String.IsNullOrEmpty(userName)) throw new ArgumentException("Value cannot be null or empty.", "userName");
            if (String.IsNullOrEmpty(password)) throw new ArgumentException("Value cannot be null or empty.", "password");

            return _provider.ValidateUser(userName, password);
        }

        public MembershipCreateStatus CreateUser(string userName, string password, string email, bool isGeneric)
        {
            if (String.IsNullOrEmpty(userName)) throw new ArgumentException("Value cannot be null or empty.", "userName");
            if (String.IsNullOrEmpty(password)) throw new ArgumentException("Value cannot be null or empty.", "password");
            if (String.IsNullOrEmpty(email) && !isGeneric) throw new ArgumentException("Value cannot be null or empty.", "email");

            MembershipCreateStatus status;
            _provider.CreateUser(userName, password, email, null, null, true, null, out status);
            return status;
        }

        public bool ChangePassword(string userName, string oldPassword, string newPassword)
        {
            if (String.IsNullOrEmpty(userName)) throw new ArgumentException("Value cannot be null or empty.", "userName");
            if (String.IsNullOrEmpty(oldPassword)) throw new ArgumentException("Value cannot be null or empty.", "oldPassword");
            if (String.IsNullOrEmpty(newPassword)) throw new ArgumentException("Value cannot be null or empty.", "newPassword");

            // The underlying ChangePassword() will throw an exception rather
            // than return false in certain failure scenarios.
            try
            {
                MembershipUser currentUser = _provider.GetUser(userName, true /* userIsOnline */);
                return currentUser.ChangePassword(oldPassword, newPassword);
            }
            catch (ArgumentException)
            {
                return false;
            }
            catch (MembershipPasswordException)
            {
                return false;
            }
        }
    }

    public interface IFormsAuthenticationService
    {
        void SignIn(string userName, bool createPersistentCookie);
        void SignOut();
    }

    public class FormsAuthenticationService : IFormsAuthenticationService
    {
        public void SignIn(string userName, bool createPersistentCookie)
        {
            if (String.IsNullOrEmpty(userName)) throw new ArgumentException("Value cannot be null or empty.", "userName");

            FormsAuthentication.SetAuthCookie(userName, createPersistentCookie);
        }

        public void SignOut()
        {
            FormsAuthentication.SignOut();
        }
    }
    #endregion

    #region Validation

    public class EmailAttribute : RegularExpressionAttribute
    {
        public EmailAttribute() : base("^[a-z0-9_\\+-]+(\\.[a-z0-9_\\+-]+)*@[a-z0-9-]+(\\.[a-z0-9-]+)*\\.([a-z]{2,4})$") { }
    }
    
    public static class AccountValidation
    {
        public static string ErrorCodeToString(MembershipCreateStatus createStatus)
        {
            switch (createStatus)
            {
                case MembershipCreateStatus.DuplicateUserName:
                    return "Username already exists. Please enter a different user name.";

                case MembershipCreateStatus.DuplicateEmail:
                    return "A username for that e-mail address already exists. Please enter a different e-mail address.";

                case MembershipCreateStatus.InvalidPassword:
                    return "The password provided is invalid. Please enter a valid password value.";

                case MembershipCreateStatus.InvalidEmail:
                    return "The e-mail address provided is invalid. Please check the value and try again.";

                case MembershipCreateStatus.InvalidAnswer:
                    return "The password retrieval answer provided is invalid. Please check the value and try again.";

                case MembershipCreateStatus.InvalidQuestion:
                    return "The password retrieval question provided is invalid. Please check the value and try again.";

                case MembershipCreateStatus.InvalidUserName:
                    return "The user name provided is invalid. Please check the value and try again.";

                case MembershipCreateStatus.ProviderError:
                    return "The authentication provider returned an error. Please verify your entry and try again. If the problem persists, please contact your system administrator.";

                case MembershipCreateStatus.UserRejected:
                    return "The user creation request has been canceled. Please verify your entry and try again. If the problem persists, please contact your system administrator.";

                default:
                    return "An unknown error occurred. Please verify your entry and try again. If the problem persists, please contact your system administrator.";
            }
        }
    }

    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
    public sealed class ValidatePasswordLengthAttribute : ValidationAttribute
    {
        private const string _defaultErrorMessage = "'{0}' must be at least {1} characters long.";
        private readonly int _minCharacters = Membership.Provider.MinRequiredPasswordLength;

        public ValidatePasswordLengthAttribute()
            : base(_defaultErrorMessage)
        {
        }

        public override string FormatErrorMessage(string name)
        {
            return String.Format(CultureInfo.CurrentCulture, ErrorMessageString,
                name, _minCharacters);
        }

        public override bool IsValid(object value)
        {
            string valueAsString = value as string;
            return (valueAsString != null && valueAsString.Length >= _minCharacters);
        }

        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            return new[]{
                new ModelClientValidationStringLengthRule(FormatErrorMessage(metadata.GetDisplayName()), _minCharacters, int.MaxValue)
            };
        }
    }
    #endregion

}
